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Jan. 25, 1938. G. LONG 2,106,463 BAG OPENING MECHANISM Filed Sept. a, 1936‘ 4 sheets-sheet 1 George lofzkgf- > gum; Jan. 25, 1938. a. LONG 2,106,463 BAG OPENING MECHANISM Filed Sept. 8, 1936 _ _ _ _ _ _ . 4 Sheets-Sheet 2 Jan. 25,- 1938. ‘ a. LONG ' 2,106,463 _ BAG OPENING MECHANISM Filed ‘Sept. s, 1936 4 Sheets-‘Sheet 4_ YE. Geore Z0 g-ww 1, -Pstented--Jsm25,1938_ ‘ a " 2,106,463 _ I UNITED‘ STATES. PATENT" OFFICE BAG OPENING MECHANISM ‘George Long, Joliet, I'll., assignor, by meme as-' signments, tocFranklh'r Steel Works, Juliet, Ill., a corporation of Maine ' . Application September s', 1936, ‘Serial No. 99,776 - 18 Claims. I (Cl. 93-day The invention relates to bag handling mecha- ‘ ’ stantially along line 4-4 of Figure 1 and show nism and has particular reference to an im- I ing the mechanism for actuating the ?ngers of proved bag feeding magazine having associated the bag opening means; ' therewithnovel bag opening means for succesFigure 5 is a horizontal sectional view taken sively ‘removing a collapsed bag from the maga- immediately abovethe support for the bag open- 5 zinc and opening the same, whereby the open bag may be delivered to other mechanism having operation to ?ll the bag. ' Automatic machines for ?lling and closing cof-_ sume when inserted within the same; 10 fee bags generally include a magazine and'means for opening the collapsed bags supported by the i ' ' Figure 'l is an elevational view showing the bag 10 of Figure 6 after the ?ngers have been rotated - magazine. The improvements of the invention. have been particularly adapted for use in con, ing ?ngers; ' Figure 6 is an elevational view showing a col lapsed bag and the position which the ?ngers as- = to open said bag; and- ~ - Figure 8 is a side elevational view of the open nection with the bag ?lling and closing mecha- bag of Figure 7. l5 nism shown in the application of George Long n Referring to-the drawings, particularly Figure 15 and Elwell B. Larsen, Serial ‘No. 87,972, ?led - 1, the supporting structure for supporting the ap-‘ June 29’, 1936, although of course the utility of paratus of the invention consists ‘of a plurality the invention is not 1imited to this or any special of uprights Ill, H and I2 which rest on any suit type of machine but on the‘ other hand will ?nd able foundation such as l3. The central upright 20 extensive application in many arts. ' ll extends considerably'above the base structure 20 The primary object of the invention is “to provide novel bag opening ?ngers and actuating means therefor which will produce vertical movement of the ?ngers for insertion within a col25 lapsed bag and simultaneous horizontal movement and rotation to withdraw the bag from the magazine and open the same. ‘ of the machine as shown in Figure 4 and by means of horizontal brackets l4 supports the frame ii of thetbag opening mechanism to be vmore particularly described. A platform l6 ex tends under the frame to support the bags during 25 opening thereof by‘ the bag opening means, the ' a, same having integrally ?xed thereto the huh I‘! Another object of the invention is to provide which isv vertically movable on the upright ll. ‘bag opening ?ngers and means for actuating the The links l8 pivotally connect the hub l1 and 30 same in a novel and improved manner which will the movable blocks 20 supported on the founda- 30 impart bodily movement to the ?ngers in spaced horizontal and spaced vertical planes. ' tion plate 2| and have threaded connection with . the shaft 22 which can be rotated by the opera Another object of the invention is to provide tor to thereby elevate or lower the platform and v bag opening means having improved operation thus position the same at the desired heightfor 3;, ‘for opening a ‘collapsed bag, whiclnywill be‘ ‘of the particular bags operated on by'the machine. .‘ 35 simple construction and economical to manufac- , The bag feeding mechanism indicated in its en ture. * tirety by numeral 23 is suitably supported on With these and other objects in ‘view the in- plate 24 to which is ?xed the depending shaft 25. vention may consist of certain novel features of Said shaft provides a rack having meshing en40 construction and operation, as will be more fully gagement with the pinion 26 journalled in bear“ 1 described and particularly pointed out in the speci?cation, drawings and claims appended ing 21 suitably supported from upright l2. Rota tion of the pinion is effected by handle 28 and hereto. thus the operator can elevate or lower the bag - v > In the drawings which illustrate an embodi- ' feeding mechanism to conform to the position of ;, ment of the invention and wherein like reference the platform l6. ‘ I characters are used to designate like partsFigure 1 is an elevational view showing in as- ' The'bag feeding mechanism shown in detail inv Figures 2 and 3 comprises a ‘pair of spaced side sociated relation the improved bag feeding maga-' plates 30 which provide the arcuate base mem zine and bag opening means of the invention; 5-.» Figure 2 is a longitudinal sectional view‘ of ber 3| of the mechanism. \_ Each side plate has suitably secured thereto the'upstanding brackets l l the magazine for supporting and feeding collapsed bags; Figure 3 is a front elevational view of the bag magazine shown'in Figure 2; 55 Figure 4 is a vertical sectional view taken sub- 32 which act as supports for the side frames 33, the said supports retaining the-frames in spaced relation and in supported position on base 3|. As will be clear from Figure 2 the base 3| does not extend the full length of the frames 33, the said / ‘ 2 2,106,463 opening or gap in the base being completed by an endless belt 34 passing over roller35, journalled in the side plates 30 and located at the forward end ‘of the mechanism and also passing over a large driving roller 36 likewise journalled in the side plates 30 and located in substantial verti cal alignment with the terminal end of the arm ate base 8|. The collapsed paper bags indicated by numeral 3'! are thus'supported by base 3| 10 and by the revolving belt 34, said belt having movement to propelthe bags in a forward direc tion so that the forward bag can be readily re moved by the bag opening means. A rolling block 1.5 outer end bracket 54, as previously de‘scribed'for supporting one of the bag opening ?ngers. The slides are mounted for horizontal recipro cating movement in the member 18 which in turn is supported by the vertical guide member so as to have vertical reciprocating movement. The said guide 80 extends from end to end of the frame l5 and has fiat sidesconnected by V-shaped-sur faces, as clearly shown in Figure 5. Member 18 ‘completely surrounds the guide 8|) having opposed flat surfaces for engagement with thesides there 10 of which are connected by portions having angu lar surfaces ?tting the grooves of said member. or other suitable weighted member 38 is located ' As best shown in Figure 1, link 8| is pivotally conto the rear of the collapsed paper bags and fur-' nected to member 18 at 82, said link being pivoted ther propels the bags in a‘ forward direction. at its upper end to lever- 83 journalled for rotation Said block may be providedwith a thrust plate ' in the frame 6_ | by shaft 84. Link 85 connects the 40 pivotally secured at 4| to the bar 42 and rearwardly extending portion of the lever to an yieldingly biased in a counter-clockwise direction _ arm 85 which is supported for pivotal movement 20 by'the coil spring 43. ‘ i " by shaft ‘II. The cam follower 81 rides within a 20 The collapsed .paper bags are retained at the cam race formed in'the cam‘5'l and is ?xed to the forward end of the mechanism by a bottom clip 44, ‘side clips,45 and a top clip 45 which engages the top of the longestside of the bag, as will be arm 85 which thus imparts motion to the link age described to effect vertical reciprocation of the member 18 which thus carries with it the slides opening ?ngers to pass between the collapsed sides of the bags. The clip 45 forms a part of the from the following description. 25 clear from Figure 3, thereby enabling the bag _ frame 41 suitably supported in position over the top of the bags by the bar 48, having connection 30 with block 49 which is ?xed to the upright l2. The side guides 50, which engage and support the sides in the vicinity of the upper portion of the ' bags, are also supported by the frame 41. , 55 and the bag opening ?ngers, as will be clear 25 ' ‘ Each slide 54 carries bracket 55 which journals shaft 53 carrying one of the fingers. Each shaft 53 extends a short distance above bearing 54 and has suitably secured thereto a link 88, Figure 5. The outer end of each link, as at ‘89, is pivotally secured to an arcuate link 90 pivoted at 9| to the _ rigid arm 82 ?xedly secured to and thus carried by The bag opening ?ngers 52, Figures 1 and 3, are the member 18. Whenthe channel members ‘I5 35 eccentrically ?xed to shafts 53 which are jour are reciprocated, motion is imparted to the slides ml nalled by brackets 54 suitably secured to'the hori-" 55 which bodily moves its ‘respective bag opening zontal reciprocating bars 55. These bars in addi '?n'ger from the full line position shown in Figure tion to their horizontal ‘movement have vertical 5 to the dotted line position. However, the shaft movement which results‘in the bag opening ?n thereof has operative connection ‘through the gers having a rectangular movement. The down ' links to a stationary member 92 and as a result of 40 ward and upward strokes of this rectangular this relative movement rotation of each shaft 53 is 5 movement are utilized to thrust the ?ngers into thecollapsed bag and to withdraw them from the bag opened thereby. The horizontal movement 45 produces rotation of the ?ngers so that they alter ' nate from a ?at'position, which they assume when ' they enter the bag, as shown in Figure 6, to a par '50 allel position as shown in Figure 7. The mecha nism for producing this rectangular motion of the bag opening ?ngers will now be described. The actuating means essentially consists of three cams 56, 51 and 58,.Figures 4 and 5, fixed’ to the cam shaft 50 suitably journalled by the spaced bracket BI and which are integral with the frame , 55 I5. Said cams may be driven by a drive shaft 52 effected, producing rotation of the bag opening ?ngers.‘ When the parts are in full line position, Figure 5, the bag opening ?ngers are disposed in spaced parallel relation and when the parts are in dotted line position, the ?ngers are disposed with their ?at sides in substantial alignment. In this I latter position the ?ngers enter the bag and the member 18 is then forced downward into its low ermost position, causing the ?ngers to be inserted within and extend for the full length of the bag 93, see Figure 6. The slides 55 are then recipro cated in a direction rearwardly to effect removal of the bag from the feeding mechanism and as a result of this reciprocation the bag opening ?n operatively'connecting with the cam shaft 60 by _ gers will be rotated sov that at the completion of means of gears 53. The cam 56 is provided with a cam race 64 within which is located a‘ cam follow said reciprocation the‘ ?ngers will assume their spaced parallel position, Figure 7. This rotation er 65 ?xed to arm 66._ Said arm is journalled in of the ?ngers, which takes place on a vertical axis bracket 6| at 51 and as shown in Figure 5 the ‘rear substantially coinciding with the outer edge of the 60 of said arm is provided with gear teeth 68. Said respectivek?nger, effects opening of the bag.‘ The teeth mesh with a pinion l8‘ ?xed to shaft 1| ?ngers are eventually withdrawn from the open 1 journalled and extending between the brackets ‘ bag by vertical upward movement of the member 18, whereupon the operations just described are 65 6|. Arms 12 are ?xed to outer extending ends of ‘repeated. said shaft and by means of links" the arms are operatively connected to slides 14, respectively, which are located on each side of the frame l5 and suitably mounted with respect to the frame so as 70 to have horizontal reciprocating motion. Secured to each slide 14 is a channel member 15, the same being vertically disposed and extending an equal distance above and ‘below the slide. The channel thereof receives the pin 16 secured by screw 11 to 75 its respective slide 55, the said slide carrying on its _However, before the bag opening ?ngers are withdrawn from the bag a plunger 94- is inserted within the same in order to hold the bag against the platform “5 while upward movement of the ?ngers takes place. The plunger is suitably ?xed to the end of rod 95 supported at its upper end by bracket 96 which extends outwardly of the member 91 suitably mounted on the guide mem ber 80 for vertical reciprocating movement within the frame IS. The‘ spaced arms of bracket 95 2,106,403 gages at one end one arm of the (bracket and the end of said’ movement they‘ assume a spaced parallel position. The movement of the plunger at the other end a stop 96 ?xed to the rod 95. downwardly until the‘ same engages the bottom The‘ plunger is thus yieldingly caused to descend within the open bag and is yieldingly forced into contact with the bottom thereof, although being positively returned to initial raised position. Cam 58 is operatively connected to member 01 of the open bag, which is accomplished by cam. 58, serves to hold the‘bag-?rmly against the base con?ne therebetween a coil spring 68 which en through link I00, lever IOI, suitably journalled 10 by shaft 04, link I02 and arm I 03, journalled by shaft ‘II and carrying a cam follower riding with in a cam race provided by cam. 58. Downward movement of the plunger occurs immediately after the bag has been opened by the ?ngers 52 15 and the same yieldingly-holds the bottom of the bag'againsta base-member I04, Figure 2, until the ?ngers are withdrawn. Said base member is supported by and forms part of the platform I94 while the ?ngers are withdrawn. It is noted thatthis downward movement of the plunger is produced through the coil spring 00, providing safety means in the event some obstruction should prevent downward movement of the 10 plunger. It will be observed that rotation of the bag opening ?ngers takes‘ place on a vertical axis which substantially coincides with the rear edge of the respective ?ngers. This construction has proven very satisfactory in quickly and emciently opening collapsed paper bags such as coffee bags and the construction has the additional advan , tage in that a. ?lling spout may be-substituted , g I6. Associated therewith are a pair of stationary for the plunger so as to'?ll the bags‘ immediately 20 spring clips I05, and a pair of movable spring _ upon opening of the same by the ?ngers. It will 20 clips I06, the latter being carried by block I01 be evident from Figure 5 that the parts effecting located below the base I04. Said block is mount ed on pins I08 and thus reciprocates vertically, rotation of the ?ngers have ample clearance with respect to the plunger which is axially ‘located which motion-is imparted thereto by the toggle and positioned directly over the opened bag. 25 levers I09. Link IIO connects the toggle levers The invention is not to be limited to or by 25 with lever III pivoted at .I I2 to block 49 ?xedly details of construction of the particular embodi secured to the upright ‘I2. vThe upper end of . ment thereof illustrated by the drawings, as var lever III is connected ‘by a relatively long link ious other forms of the device will of course be II3 to one of the arms ‘I2 as will be clear from apparent to thoseskilled in the art without de 30 an inspection of Figure 1. Movement of this parting from the spirit of the invention'or the 30 , . arm will rock lever Ill and break the toggle scope of the claims. ' formed by the toggle levers I09 with the result What is‘ claimed is: Y , that the spring clips I06 will be lowered sub- - -' ‘1. Bag opening means comprising a pair of stantially ?ush with the base I04. Return of the) 35 lever ‘I2 to its initial position, as shown in Fig bag opening ?ngers, each ?nger being substan tially ?at throughout its entire length, and means ure 1, will locate the toggle levers in a straight rotating said ?ngers from a position wherein line position, whereupon the spring clips will be , ‘the ?ngers are disposed edge to' edge with their elevated to their highestposition. This action corresponding faces in alignment to a position of the spring clips takes place in timed relation 'substantially 90 degrees, removed therefrom 40 v with the removal and opening of the bag and whereby the faces which werein alignment are bag opening ?ngers, each ?nger being substan member I04. The movable clips, together with tially ?at throughout its ' entire length, and 45 the stationary clips, will retain the bag in posi tion on the base until the plunger is withdrawn. The endless belt 34, previously described as having movement to propel the bags in a for ward direction so that the forward bag can be 50 readily removed by the bag opening ?ngers, re ceives actuation from lever III through link III which is pivotally connected to the upper end of lever I I5 suitably ?xed to shaft II6 supporting 40 disposed in- approximately parallel. planes, the clips will be elevated so as to engage the bottom of an open bag as the plunger 04 forces said bottom of the bag into contact with the base 2. Bag opening means comprising a pair of means rotating said ?ngers, from a position wherein the ?ngers are disposed edge to edge I with their, corresponding faces in alignment to a. position 90 degrees removed therefrom where by the faces which ‘were in alignment are dis posed in approximately parallel planes, the pivot axis of‘each ?nger substantially coinciding with the'outside edge of the ?ngers ' 3. ‘Bag opening means ‘comprising a pair of the driving roller 36. The pawl II'I,'carried by bag opening ?ngers, each ?nger being- substan also ?xedto shaft H6 and as the lever H5 is rocked the ratchet will-be advanced one'notch in a‘clockwise direction. The pawl I20 prevents reverse rotation of the driving roller. width less" than one-half the width of thelb'ag, and means rotating said?ngers from a position wherein the ?ngers are .disposed edge to edge with their corresponding faces in alignment to A quantity of collapsed bags will be held by the bag‘ feeding mechanism of the invention in compact relation and as the endless belt 34' is given intermittent movement, the bags will be in approximately parallel planes, the pivot axis] of each ?nger being vertical and substantially 55 lever “5.. is adapted to engage the ratchet H8 , tially ?at throughout its length and having a 60 > propelled forward of the mechanism, thus main~ taining the'forward bag ?rmly against the clips 45 and 46. The bodily movement of the ?ngers 52 may be described as rectangular since they have'downward movement for inserting the fin 70 gers when in a ?at aligned position within the collapsed bag and are then given bodily move ment in a horizontal and rearward direction to remove the bag from the mechanism and simul taneously open the bag since this bodily move ment eiTects rotation of the ?ngers whereby at a positioni90 degrees removed therei’rom whereby 60 the faces which were in aligninent‘are disposed . coinciding with the outside edge of the ?nger.' 4.-Bag opening means romprising a pair of bag opening ?ngers, each ?nger being substan tially ?at throughout its length,‘ means support ing said ?ngers for rotation on a‘ vertical axis and for bodily movement, and means producing rotation of said ?ngers from a position wherein the ?ngers are disposed edge to edge with their corresponding faces in alignment to a position 90 degrees removed therefrom whereby the faces which were in alignment are disposed in approxi mately parallel planes. ' 2,106,463 5; Bag opening vmeans comprising 'a pair of ing rotation of‘said ?ngers as a result of said 4- - bag opening ?ngers, each ?nger being substan ,rearward‘movement, whereby the ?ngers pivot \ tially ?at throughout its length, means support- ‘ from a position with their ?at surfaces in align ing said ?ngers for rotation on a vertical’ axis and ~ for-bodily movement, and means producing rota tion of said ?ngers from a position wherein the ?ngers are disposed edge to edge with their cor ment to a position 90 degrees removedthere from, which pivotal movement causes opening of the collapsed bag thereon, and a vertical recipro cating plunger having downward movement to responding faces in alignment to a ,position 90 " enter the bag after opening thereof.v degrees removed therefrom whereby the faces . 12. Bag opening means comprising a pair of which were in alignment are disposed in approxi ‘ bag opening ?ngers, supporting means for said 10 'mately parallel planes, the pivot axis of each ?ngers including bars mounted for horizontal ?nger substantially coinciding with the outside reciprocating movement and which rotatably sup edge of the ?nger. port the ?ngers permitting rotation thereof on 6. Bag opening means comprising a pair ‘of a vertical axis, a member mounted for vertical reciprocating movement, said member carrying 15 bag opening ?ngers, each ?nger being substan tially ?at-throughout its length, means support: said bars whereby the bag opening ?ngers have vertical movement in- spaced planes and hori ing said ?ngers for rotation on a vertical axis and for bodily movement, saidbodily movement zontal movement in spaced planes, and means comprising movement in a horizontal plane and producing rotation of said ?ngers as a result of 20 movement in a vertical plane, and means pro their bodily .movement in the horizontal planes. 20 l3. Mechanism for opening collapsed bags in ducing rotation of said ?ngers as a result of cluding a pair of bag opening ?ngers, support their bodily movement in a horizontal plane. 15' 7. Bag opening means comprising a pair of bag opening ?ngers, each ?nger being substan 25 tially ?at throughout its length, means support ing means for said ?ngers including bars mounted for horizontal reciprocating movement and which rotatably support the ?ngers permitting rotation 25 ing said ?ngers for rotation on a vertical axis thereof on a vertical axis, a member mounted and for bodily movement, said bodily movement including vertical reciprocating and horizontal translating movement, and means producing r0. 30 tation of said ?ngers as a result of their hori zontal translating movement, the pivot axis of each ?nger substantially coinciding with the out side edge of the ?nger. for vertical reciprocating movement, said member 8. Bag opening means comprising a pair of bag opening ?ngers, each ?nger being substan tially ?at throughout its length, means support ing said ?ngers for rotation on a vertical axis and for bodily movement, said bodily movement including motion in spaced vertical planes and in spaced horizontal planes, and means produc ing rotation of said ?ngers‘ as a result of their motion in each of the spaced horizontal planes. 9. Bag opening means comprising a pair of bag opening ?ngers, each ?nger being substan tially ?at throughout its length, means support ing said ?ngers for rotation on a vertical axis and for bodily movement, means producing rota tion' of said ?ngers as a result 'of their bodily movement to cause said ?ngers to pivot from a position with their corresponding faces in align-v ment to a position substantially 90 degrees‘ re moved therefrom, whereby said ?ngers cause opening of a collapsed bag thereon, and a vertical reciprocating plunger having downward move ‘ment to enter the bag after opening thereof. - 10. Bag opening means comprising a pair of bag opening ?ngers, each ?nger being substan tially ?at throughout its length, means support-' ing said ?ngers for rotation on a vertical axis, means imparting bodily movement to said sup porting means, including movement in a vertical plane and movement in spaced horizontal planes, and means producing rotation of said ?ngers as 65 a result of said movement in the spaced hori zontal planes. 11. Bag opening means comprising a pair of bag opening ?ngers, each ?nger being substan tially ?at' throughout its length, means support ing said ?ngers for rotation on a vertical axis, means imparting bodily movement to said- sup porting means whereby said ?ngers have down ward movement in a vertical plane to insert said ?ngers within a collapsed bag, and movement 75 rearwardly in a horizontal plane, means produc carrying said ‘bars, means producing horizontal reciprocating movement of said bars, other means vertically reciprocating ' said member whereby 30 said' bag opening ?ngers have vertical movement in spaced planes and horizontal movement in spaced planes, and means producing rotation of said ?ngers as a result of their bodily movement in the horizontal plane. ' . 35 14. Mechanism for opening collapsed bags com prising a pair of bag opening ?ngers, supporting means for said ?ngers including bars mounted, for horizontal reciprocating movement and which rotatably support the ?ngers permitting rotation 40 thereof on a vertical axis, a member carrying said bars, means mounting said member for ver tical reciprocating movement, cam means oper atively connecting with said member 'and pro ducing vertical reciprocation thereof, other cam means for producing horizontal reciprocating ‘movement of said bars, ‘whereby said bag open‘ ing ?ngers have’Vertical movement in spaced planes and horizontal movement in spaced planes, and links constructed and arrangedv to cause ro tation of said ?ngers as a result of, their bodily movement in the horizontal planes. 15. Mechanism for opening collapsed bags com prising a pair of bag opening ?ngers, supporting means for said ?ngers including bars mounted for horizontal reciprocating movement, a shaft 50 projecting upwardly- from each of. said ?ngers and being rotatably mounted by one of said bars, whereby said ?ngers are rotatable on a vertical axis, a member carrying said bars and 60 mounted for vertical reciprocating movement, means producing vertical reciprocation of said member, other means for-causing horizontal re ciprocating movement of said bars in unison, whereby said bag opening ?ngers have vertical 65 movement in spaced planes and horizontal move ment in spaced planes, and links pivotally con necting the shaft of each ?nger to said member. and constructed and arranged to produce rota tion of said ?ngers as a result of their bodily 70 movement in a horizontal plane. 16. Mechanism for openirr "f collapsed bags com prising apair of bag opening ?ngers, support ing means for said ?ngers including bars mount ed for horizontal reciprocating movement and 75 5 2,106,488 which rotatably support the ?ngers permitting rotation thereof on a vertical axis, a member carrying said bars and mounted for vertical re ciprocating movement, means vertically recip rocating said member and other means having actuation when said member is located at the extremities of its stroke to cause horizontal re cipr‘ocating movement of said bars, whereby the bag opening ?ngers have vertical movement in spaced planes and horizontal movement in spaced planes, and means operatively connecting the ?ngers with said member and constructed and arranged to produce rotation thereof as a result-of their bodily movement in the horizontal 15 planes. 1'7. Mechanism for opening collapsed bags com prising a frame having a vertical guide member extending the length thereof, a member mounted for reciprocating movement-on said guide mem member, means carried at the projecting end of each ‘bar for journalling the shaft permitting rotation thereof on a vertical axis, and ‘a bag opening ?nger ?xed to the depending endv of each shaft. 18. Mechanism for - opening collapsed bags, comprising a frame having a vertical guide mem ber extending the length thereof, a member mounted for reciprocating movement on said, guide member; a pair of bars mounted on the 10V respective sides of said member and adapted to have horizontal reciprocating movement with respect thereto; means connecting said bars to cause horizontal reciprocating movement there of while permitting vertical movementof their 15 carrying member, means carried at the project; ing end of each bar for journalling the ‘shaft permitting rotation thereof on a vertical axis, a bagopening ?nger ?xed to the depending end of each shaft, links operatively connecting each 20 shaft with said member, said links being con zontal reciprocating movement with respect. structed and arranged to produce rotation of the '20 ber, a pair of bars mounted on the respective sides' of said member and adapted to have hori thereto, means connecting said bars to cause 25 horizontal reciprocating movement thereof while permitting vertical movement of their carrying ?nger as a result of the horizontal reciprocating movement of ‘its respective bar. - > ' GEORGE LONG.